Introduction: What is wallaby.js?

Wallaby.js is an integrated continuous testing tool for JavaScript. It runs your tests immediately as you change your code (you don’t even have to save the file) and displays various results (including the code coverage, error and console messages) right inside your code editor, next to your code. Wallaby.js is great for doing JavaScript TDD (Test-driven development) or BDD (Behavior Driven Development), but it works great for other approaches as well.

Wallaby.js consists of editor plugin to provide features such as the realtime feedback and code coverage: